Bandpass

Bandpass filters are designed to isolate a relatively wide spectral band. They are classified by having bandwidths (measured at half-peak transmittance levels) between 6% and 13% of the centre wavelength value. When ordering, the bandwidth can be expressed as a percentage of the centre wavelength or can be given in microns. The filters exhibit high peak transmission in the passband (typically greater than 70%) and very low transmission levels outside the passband (typically less than 0.1%).

Typical Performance

Typical Characteristics

Available wavelength range

~2 to 20 mm

Tolerance on CWL

To customers requirements, but standard tolerances are typically +/-1% for a 6% bandwidth filter to +/-2% for a 13% bandwidth filter